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package org.glassfish.resourcebase.resources.util;

import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.ServiceHandle;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.resourcebase.resources.api.ResourceDeployer;
import org.glassfish.resourcebase.resources.api.ResourceDeployerInfo;
import org.jvnet.hk2.annotations.Service;

import jakarta.inject.Inject;
import jakarta.inject.Singleton;
import java.lang.reflect.Proxy;
import java.util.List;

/**
 * @author Jagadish Ramu
 */
@Singleton
@Service
public class ResourceManagerFactory {
    public final static String METADATA_KEY = "ResourceImpl";

    @Inject
    private ServiceLocator locator;

    public ResourceDeployer getResourceDeployer(Object resource){
        ServiceHandle<?> deployerHandle = null;
        for (ServiceHandle<?> handle : locator.getAllServiceHandles(ResourceDeployerInfo.class)) {
            ActiveDescriptor<?> desc = handle.getActiveDescriptor();
            if (desc == null) continue;
            
            List<String> resourceImpls = desc.getMetadata().get(METADATA_KEY);
            if (resourceImpls == null || resourceImpls.isEmpty()) continue;
            String resourceImpl = resourceImpls.get(0);
            
            if(Proxy.isProxyClass(resource.getClass())){
                for(Class<?> clz : resource.getClass().getInterfaces()){
                    if(resourceImpl.equals(clz.getName())){
                        deployerHandle = handle;
                        break;
                    }
                }
                        
                if(deployerHandle != null){
                    break;
                }
            }
                
            if(resourceImpl.equals(resource.getClass().getName())){
                deployerHandle = handle;
                break;
            }
                
            //hack : for JdbcConnectionPool impl used by DataSourceDefinition.
            //check whether the interfaces implemented by the class matches
            for(Class<?> clz : resource.getClass().getInterfaces()){
                if(resourceImpl.equals(clz.getName())){
                    deployerHandle = handle;
                    break;
                }
            }
                    
            if(deployerHandle != null){
                break;
            }
        }
        
        if (deployerHandle != null){
            Object deployer = deployerHandle.getService();
            if(deployer != null && deployer instanceof ResourceDeployer){
                return (ResourceDeployer) deployer;
            }
        }
        
        return null;
    }

}
